Transcript AS-100-C1_L1

Discovering Flight
Chapter Overview
Discovering Flight
The Early Days of Flight
Chapter 1, Lesson 1
Lesson Overview
How humans tried to fly in ancient times
Key aviation devices created during
ancient times
Why machines do not fly the way birds
do
Chapter 1, Lesson 1
Warm Up Questions
CPS Questions
(1-2)
Chapter 1, Lesson 1
Courtesy of Comstock Images
Quick Write
Why do you think the idea of flight
is so appealing to people?
Does it appeal to you? Why?
(Note to Instructor: Use “Pick a Student” button in CPS)
Chapter 1, Lesson 1
How Humans Tried to
Fly in Ancient Times
Chapter 1, Lesson 1
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Flight in Ancient Times
Humans have dreamed of taking flight
for thousands of years
Flight is the act of passing through the
air on wings
People told tales about flight around the
fire at night and handed down these
stories to their children
Chapter 1, Lesson 1
Daedalus and Icarus
One of the best known is the Greek
story of Daedalus and his son, Icarus
Chapter 1, Lesson 1
Courtesy of the Granger Collection, New York
First True Stories of
Human Attempts to Fly
Some early inventors made devices of
lightweight material in imitation of birds’
or bats’ wings
They strapped the devices onto their
arms or legs, and then they would jump
from the top of a tower
Unfortunately, none of the devices
succeeded
Chapter 1, Lesson 1
Armen Firman
 A Moor named Armen Firman
made the first known human
attempt to fly
 He put on a huge cloak and
jumped from a tower in
Cordoba, Spain
 He hoped the cloak would open
wide like a bat’s wings to slow
him on the way down
 But it didn’t, and Firman fell to
his death
Armen Firman
His unfortunate experiment might be
described as an early attempt at a jump by
parachute
A parachute is a device intended to slow free
fall from an aircraft or another high point
Chapter 1, Lesson 1
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Chinese Kites
 A lot of ancient scientific progress took place in
China. The Chinese invented the kite around 1000
BC
 A kite is a light framework covered with paper or
cloth, provided with a balancing tail, designed to
be flown in the air
 Within a few hundred years, people were using
kites in warfare to spy on enemies.
 Around AD 1300 an explorer, Marco Polo saw
Chinese sailors attached t kites as “eyes in the
sky” observing enemy actions
Chapter 1, Lesson 1
Chinese Gunpowder
In the 800s AD, the Chinese made
another important invention: gunpowder
Gunpowder is an explosive powder
made of potassium nitrate, charcoal, and
sulfur, used to shoot projectiles from guns
200 years later, the Chinese used
gunpowder to make the first simple
rockets
Chapter 1, Lesson 1
Chinese Rockets
 A rocket is a large, cylindrical object
that moves very fast by forcing burning
gases out one end of the tube
 The Chinese used these devices
mostly for celebrations, such as
holiday fireworks
 But they also used their rockets in
battle to scare off the enemy
Chapter 1, Lesson 1
Chinese Rockets and
Man in the Moon
 Chinese rockets were the
basis for a legend about a
rocket trip into space
 A legend is an unverified
story handed down from
earlier times
 Wan Hoo fastened 47
rockets to a chair in hopes
to going to the moon
Chapter 1, Lesson 1
Courtesy of NASA Marshall Space Flight Center
Learning Check #1
CPS Questions
(3-4)
Chapter 1, Lesson 1
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Leonardo Da Vinci
The first person in the
history of aviation who
was also a real
scientist was Leonardo
da Vinci (1452–1519)
Chapter 1, Lesson 1
Courtesy of the Library of Congress
Leonardo Da Vinci
•
Da Vinci kept good records of things he had
actually seen as well as things he thought up. The
notebooks included 160 pages of drawings of his
projects for flight.
•
Da Vinci understood several key concepts in
aviation such as streamlining.
•
Streamling is designing an aircraft to reduce
resistance to motion through the air.
Chapter 1, Lesson 1
Courtesy of the Granger Collection, New York
A Parachute and
A Helicopter
 Da Vinci produced the first
known designs for a
parachute and a helicopter
 A helicopter is an aircraft
 that gets its lift from spinning
blades
 Da Vinci’s drawing of an
“aerial screw” looks a lot like a
modern helicopter
Chapter 1, Lesson 1
A Parachute and
A Helicopter
 Today’s parachutes are based on
principles first described by Da Vinci
 He wrote that his invention would
allow someone to “throw himself
down from any height without
sustaining any injury”
Chapter 1, Lesson 1
Gliders
 Da Vinci also researched the idea of a glider
 A glider is a light aircraft without an engine,
designed to glide after being towed aloft or
launched from a catapult
 Gliders were the first aircraft
that had directional control
Chapter 1, Lesson 1
Ornithopters
 Da Vinci was fascinated with birds and
experimented with flapping-wing machines
 He worked out designs for ornithopters
 An ornithopter is an aircraft
designed to get its support
and forward motion from
flapping wings
Chapter 1, Lesson 1
Learning Check #2
CPS Questions
(5-6)
Chapter 1, Lesson 1
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Why Machines Do Not
Fly the Way Birds Do
Chapter 1, Lesson 1
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Principles of Bird Flight
 A bird’s flight is similar to an airplane’s
in some ways and different in others
 There are two phases of bird flight:
 A ground phase
 And a lift phase
Chapter 1, Lesson 1
Birds’ Wings
Wing feathers are arranged much like
shingles on a roof
They change position when the bird is
flapping
On the downbeat of the wing, the feathers
are pressed together so little air can pass
through them
On the up stroke the feathers open
Chapter 1, Lesson 1
Daniel Bernoulli
 The Dutch-born
scientist Daniel
Bernoulli (1700–1782)
discovered that a fluid
has a constant
pressure, but when a
fluid starts to move
faster, the pressure
drops
Chapter 1, Lesson 1
Taken from wikipedia.com
Bernoullian Lift
Wings are designed to make air flow
faster over their tops—this makes the
pressure drop and the wings move
upward, defying the force of gravity
This phenomenon is known as
Bernoullian lift or induced lift
Chapter 1, Lesson 1
Sir Isaac Newton
The Englishman
Sir Isaac Newton
(1643-1727)
formulated three
famous laws of
motion
Chapter 1, Lesson 1
Taken from wikipedia.com
Newtonian Lift
The third law states, “For every action,
there is an equal and opposite reaction”
For example, when a pilot angles the
wing of the plane up against the
oncoming wind, the action of the wind
causes a reaction by the wing
This reaction provides some additional
lift, known as Newtonian or dynamic lift
Chapter 1, Lesson 1
Why Some Ancient Inventors
Tried to Mimic Bird Flight
At the beginning of aviation history,
flapping wings seemed to be what flight
was all about
People observed birds, bats, and
insects flying this way
Some early inventors thought feathers
might possess some lifting power of
their own
Chapter 1, Lesson 1
Why Some Ancient Inventors
Tried to Mimic Bird Flight
 And even a thinker as brilliant as Da Vinci got
stuck on birds as the model for human flight
 It was the Newtonian lift and Bernoullian lift
that both bird flight and the flight of humanmade aircraft rely on
 Airplanes are fixed-wing aircraft
 Only when people stopped trying to fly as
birds do did the way open for the Wright
brothers’ success on the North Carolina
dunes
Chapter 1, Lesson 1
Learning Check #3
CPS Questions
(7-8)
Chapter 1, Lesson 1
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Review
Humans have dreamed of taking flight for
thousands of years
Some early inventors made devices of
lightweight material such as cloth or
wood, in imitation of birds’ or bats’ wings
The Chinese invented the kite around
1000 BC
They also invented gunpowder and
rockets
Chapter 1, Lesson 1
Review
Leonardo da Vinci produced the first
known designs for a parachute and a
helicopter
Da Vinci also researched the idea of a
glider and some designs for ornithopters
There are two phases of bird flight—a
ground phase and a lift phase
Chapter 1, Lesson 1
Review
 Wings are designed to make air flow faster
over their tops
 This makes the pressure drop and the wings
move upward, defying the force of gravity—
this is known as Bernoullian lift or induced lift
 Newton’s third law of motion states, “For
every action, there is an equal and opposite
reaction”
 This reaction provides some additional lift,
known as Newtonian or dynamic lift
Chapter 1, Lesson 1
Review
By now you’re beginning to understand
that birds and airplanes don’t work
exactly alike:
Airplanes are fixed-wing aircraft and
rely on their propellers to get them off
the ground
Chapter 1, Lesson 1
Review Questions
CPS Questions
(9-10)
Chapter 1, Lesson 1
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Summary
 How humans tried to fly in ancient
times
 Key aviation devices created during
ancient times
 Why machines do not fly the way birds
do
Chapter 1, Lesson 1
Next….
Done—
discovering flight
Next—the early
days of flight
Chapter 1, Lesson 1
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